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unexelf.c doesn't always work on Solaris


From: Drazen Kacar
Subject: unexelf.c doesn't always work on Solaris
Date: Wed, 21 Aug 2002 02:54:58 +0200

Hi,

I've compiled Emacs 21.2 with gcc 3.2 on Solaris 8 and specified
LDFLAGS="-Wl,-zcombreloc". That's a linker flag which asks for some
optimizations, so the start-up will be faster.

With that in place, "emacs -batch" works, but starting Emacs without that
option ends in SIGSEGV. The problem is that the stuff in unexelf.c
doesn't know how to handle a single combined relocation section.

I could try to make it work, but the code is messy and I rather wouldn't.
A simple and elegant solution is to use Solaris dldump() function, like
this:

#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>

int
unexec (char *new_name, char *old_name, unsigned int data_start,
        unsigned int bss_start, unsigned int entry_address)
{
    if (dldump (0, new_name, RTLD_MEMORY))
    {
        fprintf (stderr, "unexec(): dldump(%s): %s\n", new_name, dlerror());
        exit(1);
    }

    return 0;
}

With that in place everything works perfectly. You just need to add a
configure check for dldump() (it can be accessed on Solaris by linking in
libdl).

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